Abstract
The built-up columns are generally used in industrial buildings, either as posts for cladding when their buckling length is very long, or as columns supporting a crane girder. The built-up columns are composed usually of two parallel chords interconnected by lacings or battens. In the paper the special type of built-up column will be analysed from Llentab Company. It consists from four parallel chords with cold-formed C cross-sections which are interconnected by lacing in one plane and by battens in four perpendicular planes. Such types of columns are especially convenient for the relatively high light steel halls. Analysis of the behaviour of such column will be performed: a) on the model with smeared equivalent bending and shear stiffness’s using analytical solution, b) on the discrete model using FEM and commercial program ANSYS. The theory of the second order taking into account the initial imperfections and the shear deformations will be employed.
Highlights
Introduction and input dataThe paper deals with a special type of built-up cold-formed steel (CFS) column with a combination of battens and lacings and compares the analytical solution with the numerical one
In the xz-plane, the chords are connected by lacings of CFS cross-section element C-OB in one plane and in the xy-plane chords are connected by battens (200x200x4mm) in four planes
The normal force in C-section in the analytical solution can be obtained from the formula (6.69) given in 6.4.1(6) in EN 1993-1-1 [1] or from the formula (6.72) given in 6.4.1(6) in EN 1999-1-1 [2]: ( ) Nch,Ed
Summary
The paper deals with a special type of built-up cold-formed steel (CFS) column with a combination of battens and lacings and compares the analytical solution with the numerical one. In the paper are processed only the results of internal forces in individual chords. CFS cross-sections from Llentab Company are used. The built-up CFS column is composed of four chords of CFS cross-section elements C-8B. In the xz-plane, the chords are connected by lacings of CFS cross-section element C-OB in one plane and in the xy-plane chords are connected by battens (200x200x4mm) in four planes. The column is loaded by axial force NEd = 1000 kN, bending moment MEd,y = 90 kNm and horizontal force HEd,z = 41.52 kN.
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